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No. 402,426. Patented Apr. so, 1889.

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WMM/meow UNITED ASTATES PATENT OFFICE.

BERNERD RI'LERs, JR., or RocHnsrER, NEW YORK.

.PAPER-"PULP SCREEN.

SPECIFICATION forming part of Letters Patent No.4102,426, dated April 30, 1889. Application filed October b, 1887. Renewed March 6, 1889. Serial No. 302,198. (No model.)

To @ZZ whom it may concern:

Be it known that I, BERNERD EILERs, J r., of Rochester, New York, have invented certain Improvements in Paper-Pulp Screens, of which the following is a specication.

My invention relates to` certain improvements in screens for paper-pulp, designed more especially for use in screening the pulp made from wood bygrinding-machines, but capable of being applied to other purposes of y a similar nature.

My invention has for its object the production of a cheaper and more durable screen than has been hitherto employed; and to this end it consists in improvements in the construction, which are fully described and illustrated in the following specification and accompanying drawings, and the novel features thereof speciiied in the claims annexed to the said specification.

In the accompanying drawings, representing a paper-pulp screen embodying my invention, Figure 1 is a side elevation. Fig. 2 is a vertical longitudinal section of la portion of the machine. Fig. 3 is a vertical section through the `outlet or discharge pipe.

My improved paper-pulp screen consists, essentially, of a suitable supporting-frame lor frame-work, A A B B, a trough or pulp-receptacle, C, provided with a perforated or slotted sieve or screen, D, the vibrating bottom E, which receives motion from the revolving shaft F by eccentrics G G and arms H H, and the outlet or discharge pipe I II. The machine is also provided with the inletpipe J and the overiiow or waste pipe K, through which the discharge of knots and material too large to pass through the screen is eected. The trough is constructed of any shape or dimensions adapted to the quantity of material to be run through the screen in a given time. The frame-work which supports the trough consists of the horizontal timbers A A and the uprightsB B, connected together by suitable cross -beams The shaft F extends lengthwise of the frame-work, being supported on the cross-beams by the journalboxes L L. The armsHare fastened at their upper ends to the Yvibrating bottom E, or to stiffening bars N, Fig. 2, secured thereto. The upper ends of the arms H are provided Awith widened heads or iianges O, which are secured to the bottom E by bolts or screws.

At their lower ends the arms H H are provided with boxes P P, of any ordinary or preferred construction, which engage with the eccentrics G G, formed integral with the shaft F, which is made of a diameter sufficient to permit the eccentrics to be cut on it by shifting the centers after the shaft has been turned up in a lathe. This construction of the eccentrics secures perfect accuracy in their alignment, and as they Wear evenly in practical use they can never act unequally on the bottom, so as to subject it to a twisting or bending strain, but insure an even reciprocatingand slightly-oscillating movement. Two arms and eccentrics are sufficient for screens of small dimensions, although I have represented three in the drawings, and prefer to use the higher number on screens of medium or large slzes. The eccentrics being all turned at one time on the same centers, they will' impart an exactly made of wire-cloth, perforated or slotted sheet metal of any desired dimensions of mesh or size of the opening through it, or constructed in any other usual or Vpreferred manner.

The vibrating bottom E is made slightly smaller than the opening in the frame-work which supports the trough, the intervening space between the edges of the bottom and theframe-Work being closed by a strip of leather or other suitable flexible material, S, Fig. 2. In order to facilitate the attachment of the leather strip to the frame-work, the bars or rods R, Fig. 2, are fastened to the interior of the frame-work, and the leather is nailed or otherwise secured to it. The inner edges of the leather are attached to the vibrating bottom. p

It will be observed that the screen D is supported at some little distance above the framework A by the intermediate frame,-T, to which the cross-bars Q are secured by bolts or other suitable devices. An airchamber is thus formed between the screen and the vibrating bottom, the effect of the movementof the lat- IOO ter being to force the air upward through the slots or openings in the screen, with the rcsult of keeping the screen clean and free from obstruction to the passage of the pulp through it.

The pulp mixed with a sufficient quantity of water is fed onto the screen through the inlet-pipe J, being distributed along the screen by the box or trough U.

The outletfpipe, it will be noted, is secured to the bottom E rigidly and extends down into a stationary pipe, I', having preferably an enlarged receptacle at the upper end, the discharge from the latter pipe being higher than the lower end of pipe I, so that a trap will be formed, and as a means for preventing the passage of air back through this outlet and into the chamber when the pipe is reciprocated and oscillated rapidly by the movement of the bottom E, and also to prevent displacement of the liquid by the motion I cover the top of the pipe I with a diaphragm, fi, preferably connected to both pipes, as shown. As the motion of the movable pipe I is slight, there will be very little wear upon it, so that it will last a long time. Any other Suitable trap arrangement could be as well employed that will accomplish the object of preventing vthe drawing of air through the discharge-pipe, and any other form of coupling between the movable and stationary pipes that will permit the universal movement.

I claim- 1. In a machine for screening pulp, the combination, with the trough and the screen located therein, of the vibratory bottom secured to the trough at its edges by iiexible material, and the shaft having two or more eccentrics thereon, and the rods secured to the bottom rigidly at one end and j ournaled on the eccentrics at the other, substantially as described.

2. In a machine for screening pulp, the combination, with the vibrating bottom, of the shaft having two or more eccentrics formed thereon in line with each other and of smaller diameter than the shaft, and the arms or rods attached to the bottom at their upper ends and j ournaled on the eccentrics at their lower ends, substantially as described.

3. In a machine for screening pulp, the combination, with the screen, the vibrating bottom, and means for vibrating it, of the outlet-pipe connected to the bottom, the stationary pipe, and a flexible connection between them, substantially as described.

4. In a machine for screening' pulp, the combination, with the screen, the vibrating bottom, and means for vibrating it, of the outlet-pipe connected to the bottom, the stationary pipe, an extensible connection between the two, and a trap located in said sta tionary pipe, substantially as described.

5. In a machine for screening pulp, the combination, with the receptacle, the screen located therein, the vibrating bottom, and the exible connection with the receptacle, of the shaft having the eccentrics thereon, the rods connected rigidly to the bottom and journaled on the eccentrics, the outlet-pipe attached to the bottom, the stationary pipe, and the flexible connection between said pipes, substantially as described.

6. In a machine for screening pulp, the combination, with the screen, the vibrating bottom, and means for vibrating it, of the outlet-pipe connected to the bottom, the stationary pipe having a trap therein, and the diaphragm connected to the movable and stationary pipes, substantially as described.

I BERNERD EILERS, JR. lVitnesses:

GEO. B. SELDEN,

C. G. CRANNELL. 

